Idk what yanyan means, but here's about love triangle
http://www.mangago.me/read-manga/rin/
http://www.mangago.me/read-manga/choco_strawberry_vanilla/
http://www.mangago.me/read-manga/nyannya/
http://www.mangago.me/read-manga/border/
http://www.mangago.me/read-manga/aikotoba_wa_hallelujah/
http://www.mangago.me/read-manga/docchi_ni_suru/
http://www.mangago.me/read-manga/golden_eyes/
http://www.mangago.me/read-manga/oboreru_triangle/
An YAOI manga with LOVE TRIANGLE but the second guy is YANYAN (づ ̄ ³ ̄)づ Thaaaanks ~ Daisuki